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A235868
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Union of 2 and powers of odd primes.
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2
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1, 2, 3, 5, 7, 9, 11, 13, 17, 19, 23, 25, 27, 29, 31, 37, 41, 43, 47, 49, 53, 59, 61, 67, 71, 73, 79, 81, 83, 89, 97, 101, 103, 107, 109, 113, 121, 125, 127, 131, 137, 139, 149, 151, 157, 163, 167, 169, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229
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OFFSET
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1,2
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COMMENTS
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Numbers n such that the group G_n:={x+yi: x^2+y^2==1 (mod n); 0<=x,y<n} is cyclic; i.e., numbers n such that A060968(n) = A235863(n).
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LINKS
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FORMULA
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MATHEMATICA
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Select[ Range[230], # == 2 || Mod[#, 2] == 1 && PrimeNu[#] < 2 &] (* and modified by Robert G. Wilson v, Dec 29 2016 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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